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Finding the Fourth Proportional to 640,848.60, 961,013.70 and 219,907.80

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Solution

The fourth proportional to 640,848.60, 961,013.70 and 219,907.80 is: 329,772.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,848.60 : 961,013.70 = 219,907.80 : x
  2. Step 2: Convert to fraction form
    640,848.60/961,013.70 = 219,907.80/x
  3. Step 3: Cross multiply
    640,848.60x = 961,013.70 × 219,907.80
  4. Step 4: Simplify right side
    640,848.60x = 211,334,408,536.86
  5. Step 5: Solve for x
    x = 211,334,408,536.86/640,848.60
  6. Step 6: Final answer
    x = 329,772.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.